From: Nicholas Piggin <npiggin@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Nicholas Piggin <npiggin@gmail.com>,
Randy Dunlap <rdunlap@infradead.org>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org,
Anton Blanchard <anton@ozlabs.org>,
Andy Lutomirski <luto@kernel.org>
Subject: [PATCH v3 4/4] powerpc/64s: enable MMU_LAZY_TLB_SHOOTDOWN
Date: Tue, 1 Jun 2021 16:23:03 +1000 [thread overview]
Message-ID: <20210601062303.3932513-5-npiggin@gmail.com> (raw)
In-Reply-To: <20210601062303.3932513-1-npiggin@gmail.com>
On a 16-socket 192-core POWER8 system, a context switching benchmark
with as many software threads as CPUs (so each switch will go in and
out of idle), upstream can achieve a rate of about 1 million context
switches per second. After this patch it goes up to 118 million.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 088dd2afcfe4..8a092eedc692 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -252,6 +252,7 @@ config PPC
select IRQ_FORCED_THREADING
select MMU_GATHER_PAGE_SIZE
select MMU_GATHER_RCU_TABLE_FREE
+ select MMU_LAZY_TLB_SHOOTDOWN if PPC_BOOK3S_64
select MODULES_USE_ELF_RELA
select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE
select NEED_SG_DMA_LENGTH
--
2.23.0
next prev parent reply other threads:[~2021-06-01 6:23 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-01 6:22 [PATCH v3 0/4] shoot lazy tlbs Nicholas Piggin
2021-06-01 6:23 ` [PATCH v3 1/4] lazy tlb: introduce lazy mm refcount helper functions Nicholas Piggin
2021-06-01 6:23 ` [PATCH v3 2/4] lazy tlb: allow lazy tlb mm switching to be configurable Nicholas Piggin
2021-06-01 6:23 ` [PATCH v3 3/4] lazy tlb: shoot lazies, a non-refcounting lazy tlb option Nicholas Piggin
2021-06-01 6:23 ` Nicholas Piggin [this message]
2021-06-04 16:54 ` [PATCH v3 0/4] shoot lazy tlbs Andy Lutomirski
2021-06-04 17:05 ` Andy Lutomirski
2021-06-05 0:17 ` Nicholas Piggin
2021-06-05 0:26 ` Nicholas Piggin
2021-06-05 2:52 ` Nicholas Piggin
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